nav {
    background-color: #333;
    overflow: hidden;
}

nav a {
    float: left;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

nav a:hover {
    background-color: #ddd;
    color: black;
}

#message_body{
    width: 100%;
    height: 500px;
    background: beige;
}


/*li::before {*/
/*  counter-increment: item;*/
/*  content: counter(item) ". ";*/
/*}*/